Check how to register for Self Assessment

You need to reactivate your account

This will also register you for Class 2 National Insurance contributions and help you qualify for benefits like the State Pension.

Reactivate your account online

You can sign in to reactivate your online account for Self Assessment.

You’ll need the sign in details you used to register before.

If you do not already have sign in details, you’ll be able to create them when you sign in for the first time.

If you cannot use the online form

You can use form CWF1 to reactivate your account.

You’ll need your Unique Taxpayer Reference (UTR) number.

The address to send the form to is:

Self Assessment
HM Revenue and Customs
BX9 1AN
United Kingdom

Your answers

Start again

• 1. Why do you need to send a Self Assessment tax return?: You're self-employed (for example, a sole trader)
• 1. Why do you need to send a Self Assessment tax return?: Change
• 2. Did you send a tax return last year?: No, but I have registered before
• 2. Did you send a tax return last year?: Change